package org.dyndns.merelin.pchrc.client;

import com.google.gwt.core.client.GWT;
import com.google.gwt.resources.client.ClientBundle;
import com.google.gwt.resources.client.ImageResource;
import com.google.gwt.user.client.ui.AbstractImagePrototype;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Tree;
import com.google.gwt.user.client.ui.TreeItem;

public class Mailboxes extends Composite {
    /**
     * Specifies the images that will be bundled for this Composite and specify
     * that tree's images should also be included in the same bundle.
     */
    public interface Images extends ClientBundle, Tree.Resources {
        ImageResource drafts();
        ImageResource home();
        ImageResource inbox();
        ImageResource sent();
        ImageResource templates();
        ImageResource trash();

        @Source("noimage.png")
        ImageResource treeLeaf();
    }

    private Tree tree;

    /**
     * Constructs a new mailboxes widget with a bundle of images.
     * 
     * @param images a bundle that provides the images for this widget
     */
    public Mailboxes() {
        Images images = GWT.create(Images.class);

        tree = new Tree(images);
        TreeItem root = new TreeItem(imageItemHTML(images.home(), "foo@example.com"));
        tree.addItem(root);

        addImageItem(root, "Inbox", images.inbox());
        addImageItem(root, "Drafts", images.drafts());
        addImageItem(root, "Templates", images.templates());
        addImageItem(root, "Sent", images.sent());
        addImageItem(root, "Trash", images.trash());

        root.setState(true);
        initWidget(tree);
    }

    /**
     * A helper method to simplify adding tree items that have attached images.
     * {@link #addImageItem(TreeItem, String, ImageResource) code}
     * 
     * @param root the tree item to which the new item will be added.
     * @param title the text associated with this item.
     */
    private TreeItem addImageItem(TreeItem root, String title,
            ImageResource imageProto) {
        TreeItem item = new TreeItem(imageItemHTML(imageProto, title));
        root.addItem(item);
        return item;
    }

    /**
     * Generates HTML for a tree item with an attached icon.
     * 
     * @param imageProto the image prototype to use
     * @param title the title of the item
     * @return the resultant HTML
     */
    private String imageItemHTML(ImageResource imageProto, String title) {
        return AbstractImagePrototype.create(imageProto).getHTML() + " " + title;
    }
}
